Wis 16:27

“We have already said above that the manna, which endured the odor of fire, would melt at the heat of the sun; but now, since he repeats the same mystery, we believe it is enough to speak of its meaning. For that figurative food fed our fathers in a historical sense, but it melted at the rising of the true sun, that is, at the birth of Christ it was dissolved for spiritual use and was transformed into a heavenly ritual, so that we may anticipate the sun in blessings, that is, proclaim the divinity of Christ with eternal praises, saying with the evangelist John: In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God: all things were made through him, and without him nothing was made, etc. (Jn. 1:1-3). But at the rising of the light, that is, at the coming of the Savior, let us say: The Word was made flesh, and dwelt among us, and we saw his glory, the glory as of the only begotten from the Father, full of grace and truth. But let us see what follows concerning that carnal people.”

“For that which could not be destroyed by fire, namely the manna, because it hardened at fire, so that small cakes were made from it, as is clear from Numbers 11; when warmed by even a faint ray of the sun, immediately melted away, that is, it liquefied, as is clear from Exodus 16. Hence it was necessary that it be gathered in the morning.”